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Appendix E.1:Data Usability Summary <br /> • Calcium, iron, magnesium,potassium, sodium, manganese, and boron by EPA <br /> SW6010B. <br /> • Kjeldahl nitrogen by EPA Method 351.2. <br /> • Specific conductance by SM20 2510 B. <br /> • Total Dissolved Solids by SM20 2540 C. <br /> • Total Hardness SM 18 2340 B. <br /> • Total phosphorus as phosphate by EPA Method 365.1. <br /> Table E-1 presents a summary of field sample identifications, sample types, and dates for <br /> samples collected during the three sampling events at the US Can—Welty Road site. <br /> The data was evaluated in general conformance to the requirements of project objectives <br /> specified in the following documents: <br /> • Quality Assurance and Quality Control: Sample Collection, Handling, and Analysis <br /> Guidelines; Chevron Historical Pipeline Portfolio Sites, California, April 2007; <br /> • SAIC Technical Procedure TP-DM-300-7,Data Validation; and <br /> • SAIC Technical Procedure TP-DM-300-14,Evaluation of Field and Analytical Data. <br /> INTENDED USES OF THE DATA <br /> Laboratory data are being used for site evaluation and decision making for petroleum releases <br /> attributed to Chevron's historical crude-oil and Bunker C fuel-oil pipelines. The data generated <br /> will be compared to Regional Water Quality Control Board water quality objectives and may be <br /> used for risk assessment purposes. <br /> Data QC Objectives <br /> SAIC evaluated project analytical data according to the following parameters to determine their <br /> usability: <br /> • Precision <br /> • Accuracy <br /> • Representativeness <br /> • Completeness <br /> • Comparability <br /> DATA USABILITY SUMMARY <br /> The following sections summarize the findings of the data evaluation process. Immediately <br /> following are data validation qualifiers used in the data evaluation: <br /> ualifier Description <br /> E Indicates the reported value is estimated due to associated QC <br /> results. <br /> J Indicates the reported value is an estimated concentration detected <br /> between the method detection limit(MDL) and limit of <br /> quantitation (LOQ). <br /> E.1-2 Z 99 <br /> ammrj,li%�& <br /> From Science to Solutions <br />